Functional but terrible skeuomorphic design – i41CX Review

It does seem functional but I hate the way it wastes screen space to try to look like the physical version of the calculator including, ridiculously, the case and ports on the top. So, the keys are small. Key feedback is subtle and is not good. I have Calc41cx and like it a lot better, but it hasn't been updated for iOS 11 and is no longer in the App Store. There's another free alternative: my41cx-ios, but it has its problems. The interface doesn't waste space with skeuomorphism, but the interface is low contrast and it has literally no key feedback. What to do?
Review by GAPas on i41CX.